I already have a PLX-M300 wideband with a wideband output signal. Can I run that signal wire from the control unit to the o2 sensor signal into the narrowband O2 gauge and still get an accurate reading?? I don't want to have the obnoxious digital meter showing all the time but I wouldn't mind having a needle bouncing around a little bit all the time.

Will this work?

Well, I'm going to say no.

Here's the reason I'm thinking.

The narrowband O2 sensor is a 0-1 volt with 0 being super lean and 1 being super rich. 0.5 volts coming out of a narrowband O2 would be stoich.

A wideband O2 sensor is a 0-5 volt sensor, with 5 volts being lean and 0 volts being rich. About 2.5 volts (depending on sensor) coming out would be stoich.

So you have two problems. First, it's an opposite response. In other words, with a NB, the more voltage means the richer and the less means the leaner. With a WB it's the opposite.

Second, if the NB gauge is setup to only read between 0-1 volts, most of your driving with a WB will be closer to 1-4 volts, then the NB gauge will read rich most of the time, and not be indicative of what you're actually running.

Sound logical?

Brian

PS. I know that many WBO2's have narrowband outputs. These would obviously work, but from the way I read your question, I interpreted it as though you wanted to take the wideband output and see if it would work on a narrowband gauge. Was I correct?

I thought the wideband had a wideband output, separate from the wires going into the unit...I will need to do some research to see if that is a narrowband output to feed the gauge. I hope so!

Got it...check it out


So running the narrowband output to the narrowband gauge, will that be more accurate than running the rear o2 sensor to the A/F gauge since the wideband controller is still processing the wideband signal and spitting it out as a **more accurate** narrowband signal?

you can run the narrow band output to the blinky ricer narrowband if you must have it.
Its not rocket science
Narrow band output goes to a narrow band
Wideband goes to the wide band
Would you hook up the printer connection to your monitor :P

The purpose of the narrow band output is to actually send to the ECU and omit the stock narrow band sensor all together.